Appeal No. 2005-1458
Application No. 09/732,799 Page 4
Tsuji is concerned with the good heat conduction properties
of diamond that has lower amounts of carbon-13 than occurs in
naturally formed diamond. Tsuji provides a method of
synthesizing single diamond crystals using a carbon source
containing at least 99.9 atomic percent carbon-12. Tsuji teaches
that the carbon source is graphitized to enhance the
crystallinity of the carbon prior to synthesizing single diamond
crystals as a product via a temperature difference method. Tsuji
informs one of ordinary skill in the art that the synthetic
diamond made should be free from metallic inclusions and
irregular shaped crystals and that a further improvement can be
realized if nitrogen impurity is eliminated. See, e.g., column
3, line 2-21 and column 4, line 39 through column 5, line 4 of
Tsuji.
The examiner acknowledges that Tsuji does not disclose
adding boron into the carbonaceous material or flux (metal
solvent) used in forming a synthetic diamond by the method
disclosed therein so as to form a boron-doped diamond, as
required in appellants’ appealed method claims. See answer, page
3.
Anthony (column 1, lines 11 and 12) teaches that using a
chemical vapor deposition (CVD) synthetic diamond forming method
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Last modified: November 3, 2007